Bobw1953

Just changed the 2200 Mfd capacitor at the top centre of the main board and it has rectified the fault. £3.85 for 4 on Ebay. Was looking to possibly upgrade the system if it didn't work but looks like the system now has a few more years life in it. Will make sure i change the battery on a more regular basis in future though.

Capacitor looks ok but have seen 2 other reports with exact same symptons. Ordered a 2200 micro farad capacitor today. Will report back next week with result. If not will be looking for a new unit.

I read in 2 different posts that users with identical problems had changed the large electrolitic capacitor on the main board. No doubt it is for smoothing the output supply. Got to be worth a try before i ditch it.

The battery is changed every 4-5 years and the siren box less often. If i did not have the extra LCD display unit i would be unaware there is an issue as the main G4 unit does not indicate a fault. Would it be best to upgrade the main control unit or would it be ok to leave the unit as it is? It performs ok all functions work as expected.

Hi ive got an Optima G4 with additional LCD keypad sited close by, fitted approx 10 years ago. The mains LED is flashing on the keypad indicating a mains power issue. The power led on the main unit is steady. The error log indicates mains failure every few seconds. All fuses test ok.I can see 240v AC at input and all tests ok. The system runs ok without the battery so mains must be healthy. Battery voltage ok and can see an increase when mains reapplied. Did see a similar report on this site. The battery is main unit is only a few months old. The siren/bell box was changed recently as it went off in middle of night . I diagnosed it as faulty so changed it so that also has a new battery. Prior to old box being changed i had noticed the flashing LED on the LCD unit so could have been like this for some time. Is this a problem i should be concerned about or not. All function work ok on the alarm. I can set/ unset it and all tests of siren and strobe function ok along with tamper. Any ideas or anything else i can try to resolve this issue.